Sunan an-Nasa'i 5200
سنن النسائي#5200SahihIt was narrated that Anas said:"The ring of the Prophet [SAW] was made of silver and its stone (Fass) was made of silver too
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 48:161